Oral Anatomy 3 - The Mandibular First Premolar

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Author:
james14hunter
ID:
286639
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Oral Anatomy 3 - The Mandibular First Premolar
Updated:
2014-10-22 08:50:05
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Oral Anatomy Mandibular First Premolar
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Oral Anatomy 3 - The Mandibular First Premolar
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Oral Anatomy 3 - The Mandibular First Premolar
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  1. How does the mandibular first premolar generally appear?
    • This is the smallest premolar. 
    • As it comprises a dominant buccal cusp and a very small lingual cusp that appears not unlike a cingulum, some consider it to be a modified canine.
  2. How does the mandibular first premolar appear from the occlusal aspect?
    • From the occlusal aspect, more than two-thirds of the buccal surface is visible, although only a small portion of the lingual surface can be seen.
    • The occlusal outline is diamond shaped and the occlusal table, outlined by the cusps and marginal ridges, is triangular.
    • The buccal cusp is broad, with its apex approximately overlying the midpoint of the crown.
    • The lingual cusp is less than half the size of the buccal cusp.
    • The buccal and lingual cusps are connected by a blunt, trnasverse ridge that divides the poorly developed mesiodistal occlusal fissure into mesial and distal fossae.
  3. What are the cusps like for mandibular first premolar?
    • The buccal cusp is broad, with its apex approximately overlying the midpoint of the crown.
    • The lingual cusp is less than half the size of the buccal cusp.
    • The buccal and lingual cusps are connected by a blunt, trnasverse ridge that divides the poorly developed mesiodistal occlusal fissure into mesial and distal fossae.
    • The mesial fossa is genearlly smaller than the distal fossa.
    • A canine groove often extends from the mesial fossa over the mesial marginal ridge onto the mesiolingual surface of the crown.
  4. How does the mandibular first premolar appear when viewed buccally
    • Viewed buccally, the crown is nearly symmetrical, though the mesial profile is more curved than the distal.
    • The buccal surface is markedly convex in all planes.
  5. How does mandibular first premolar appear from the lingual aspect?
    • From the lingual aspect the entire buccal profile and the occlusal surface are visible.
    • Thus, the mandibular first premolar differes from other premolars in that the occlusal plane does not lie perpendicular to the long axis of the tooth but is inclined lingually.
    • The tilt of the occlusal plane can also be appreciated from the mesial and distal aspects.
  6. What is the cervical margin and the root like for mandibular first premolar?
    • The cervical line follows an almost level course around the tooth.
    • The root is single, conical and oval to nearly round in cross section.
    • The root is grooved longitudinally both mesially and distally, the mesial groove being the more prominent.

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